10-09-2026, 07:31 AM
Hello,
Follow-up on the N30 polarity issue, with more measurements.
Setup: KCS firmware, "Bidirectional CT Mode" enabled. All CT clamps were installed in the same direction (same orientation for all 30 channels).
Result:
- BL0910 #1 (Energy 1, ch1-10): power is positive when consuming -> correct.
- BL0910 #2 and #3 (Energy 2 and Energy 3, all channels): power AND current are negative when consuming -> inverted.
It is always the whole chip, never individual channels. Every active channel on modules 2 and 3 reads negative under load, while every channel on module 1 reads positive.
Production test: Energy 3 ch7 carries 2x500 W PV + pool pump (pump off). This morning the line was producing (micro-inverter reported 110 W), and the N30 reported +122.7 W, i.e. the same sign as consumption on that chip. So the chip 2/3 polarity is reversed relative to chip 1.
Energy counters (kWh) keep increasing whatever the sign, so they are fine for loads, but the production/consumption direction cannot be used from KCS for modules 2 and 3.
Since the clamps are installed consistently and only chips 2 and 3 are affected, this looks like a board-level polarity issue (voltage reference or current inputs on BL0910 #2/#3), not an installation problem. Re-turning the clamps is not practical (requires cutting power to the whole house).
Could you please provide one of the following:
1. a fix in the ARM firmware that compensates the polarity of BL0910 #2 and #3, or
2. an "invert direction" setting in KCS, per module (Energy 1/2/3) or per channel.
For now I correct the sign in Home Assistant, but a fix at the source would be much better.
Thank you.
Follow-up on the N30 polarity issue, with more measurements.
Setup: KCS firmware, "Bidirectional CT Mode" enabled. All CT clamps were installed in the same direction (same orientation for all 30 channels).
Result:
- BL0910 #1 (Energy 1, ch1-10): power is positive when consuming -> correct.
- BL0910 #2 and #3 (Energy 2 and Energy 3, all channels): power AND current are negative when consuming -> inverted.
It is always the whole chip, never individual channels. Every active channel on modules 2 and 3 reads negative under load, while every channel on module 1 reads positive.
Production test: Energy 3 ch7 carries 2x500 W PV + pool pump (pump off). This morning the line was producing (micro-inverter reported 110 W), and the N30 reported +122.7 W, i.e. the same sign as consumption on that chip. So the chip 2/3 polarity is reversed relative to chip 1.
Energy counters (kWh) keep increasing whatever the sign, so they are fine for loads, but the production/consumption direction cannot be used from KCS for modules 2 and 3.
Since the clamps are installed consistently and only chips 2 and 3 are affected, this looks like a board-level polarity issue (voltage reference or current inputs on BL0910 #2/#3), not an installation problem. Re-turning the clamps is not practical (requires cutting power to the whole house).
Could you please provide one of the following:
1. a fix in the ARM firmware that compensates the polarity of BL0910 #2 and #3, or
2. an "invert direction" setting in KCS, per module (Energy 1/2/3) or per channel.
For now I correct the sign in Home Assistant, but a fix at the source would be much better.
Thank you.